java.lang.IllegalStateException: No host

java.lang.IllegalStateException: No host
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1184)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1179)
at android.support.v4.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:1991)
at android.support.v4.app.Fragment.performActivityCreated(Fragment.java:1976)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1041)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1197)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:738)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1562)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:483)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4998)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)

at dalvik.system.NativeStart.main(Native Method)

使用Fragment的时候遇到了这个问题，由于我在切换fragment的时候加入了动画效果，当动画正在执行时，用手指滑动（Pad版相册）或者按下遥控器按键（TV版相册）就会crash，出现如上log。

出现这个bug的原因是我将touch事件和onKey事件传递给了Fragment，而这个时候Fragment还在动画状态中，“No host”，没有附着到Activity上面。

因此，解决方法就是在Fragment切换动画时候，标识下这个状态，在这个状态下，Activity的touch事件和onKey事件自己处理即可。

 @UiThread        void changeFragment(BaseAlbumFragment targetFragment,        int showAnim, int fadeAnim) {            baseAlbumFragment = targetFragment.newInstance(this);            isFragmentStatOk = false;            fragmentManager                    .beginTransaction()                    .setCustomAnimations(showAnim, fadeAnim, showAnim,                            fadeAnim)                    .replace(R.id.album_container, baseAlbumFragment)                    .setTransitionStyle(FragmentTransaction.TRANSIT_FRAGMENT_FADE)                    .commit();        backStatus();    }    @Background(delay = 2000)    void backStatus(){        isFragmentStatOk = true;    }

 @Override    public boolean dispatchKeyEvent(KeyEvent event) {        if(!isFragmentStatOk){            return true;        }        return super.dispatchKeyEvent(event);    }

   @Override    public boolean dispatchTouchEvent(MotionEvent ev) {        if(!isFragmentStatOk){            return true;        }        return super.dispatchTouchEvent(ev);    }

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